Absolute Konfiguration der enantiomeren ?-Cyclogeraniums�Uren, ?-Cyclogeraniale, ?-Jonone, ?-Jonone, ?-und ?-Carotine
摘要:
AbstractBy chemical correlation with manool and ambrein the absolute configurations of the enantiomeric α‐cyclogeranic acids, α‐cyclogeranials, α‐ionones and α‐ and ϵ‐carotenes have been elucidated.
Absolute Konfiguration der enantiomeren ?-Cyclogeraniums�Uren, ?-Cyclogeraniale, ?-Jonone, ?-Jonone, ?-und ?-Carotine
摘要:
AbstractBy chemical correlation with manool and ambrein the absolute configurations of the enantiomeric α‐cyclogeranic acids, α‐cyclogeranials, α‐ionones and α‐ and ϵ‐carotenes have been elucidated.
Syntheses of the Enantiomers of ?-Cyclogeranic Acid, ?-Cyclocitral, and ?-Damascone: Enantioselective protonation of enolates
作者:Charles Fehr、Jos� Galindo
DOI:10.1002/hlca.19950780303
日期:1995.5.10
thiol ester enolate with (−)- or (γ)-N-isopropylephedrine((−)- or (γ)-20) and subsequent hydrolysis of the (R)-and (S)-S-phenyl γ-thiocyclogeranate ((R)- and (S)-24, resp.; 97% ee). The esters (R)- and (S)-24 were also used as precursors of (R)- and (S)-γ-damascone ((R)- and (S)-5, resp.). Alternatively, (S)-5 (75% ee) was obtained by enantioselectiveprotonation of ketone enolate 29 with (−)-N-isopropylephedrine
Isomer composition containing optically active ethyl trans-2,2,6-trimethylcyclohexylcarboxylate and fragrance composition containing the isomer composition
申请人:Takasago International Corporation
公开号:US20030207789A1
公开(公告)日:2003-11-06
A geometrical isomer composition excellent in odor and in chemical resistance, which is applicable to a base material containing a strongly alkaline chemical or a strongly acidic chemical, which can suppress the deterioration with time and the color change of the base material in the case that the material is exposed to light, and which also have highly palatable and unique fruity floral fragrance. The composition is produced by mixing 93 to 99% by weight of optically active ethyl trans-2,2,6-trimethylcyclohexylcarboxylate represented by Formula-1 or a mixture thereof and 7 to 1% by weight of optically active ethyl cis-2,2,6-trimethylcyclohexylcarboxylate represented by Formula-2 or a mixture thereof, respectively.
1